Vaccine description | |
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Target | Hepatitis B virus |
Vaccine type | Subunit |
Clinical data | |
Trade names | Recombivax HB, Engerix-B, Heplisav-B, others |
AHFS/Drugs.com | Monograph |
MedlinePlus | a607014 |
License data | |
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Routes of administration | Intramuscular (IM) |
Drug class | Antiviral |
ATC code | |
Legal status | |
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Identifiers | |
PubChem CID | |
DrugBank | |
ChemSpider |
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UNII | |
KEGG | |
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Hepatitis B vaccine is a vaccine that prevents hepatitis B. [13] The first dose is recommended within 24 hours of birth with either two or three more doses given after that. [13] This includes those with poor immune function such as from HIV/AIDS and those born premature. [13] It is also recommended that health-care workers be vaccinated. [14] In healthy people, routine immunization results in more than 95% of people being protected. [13]
Blood testing to verify that the vaccine has worked is recommended in those at high risk. [13] Additional doses may be needed in people with poor immune function but are not necessary for most people. [13] In those who have been exposed to the hepatitis B virus (HBV) but not immunized, hepatitis B immune globulin should be given in addition to the vaccine. [13] The vaccine is given by injection into a muscle. [13]
Serious side effects from the hepatitis B vaccine are very uncommon. [13] Pain may occur at the site of injection. [13] It is safe for use during pregnancy or while breastfeeding. [13] It has not been linked to Guillain–Barré syndrome. [13] Hepatitis B vaccines are produced with recombinant DNA techniques and contain immunologic adjuvant. [13] They are available both by themselves and in combination with other vaccines. [13]
The first hepatitis B vaccine was approved in the United States in 1981. [15] A recombinant version came to market in 1986. [13] It is on the World Health Organization's List of Essential Medicines. [16] Both versions were developed by Maurice Hilleman and his team. [17] [18] [19]
In the United States vaccination is recommended for nearly all babies at birth. [20] Many countries routinely vaccinate infants against hepatitis B. In countries with high rates of hepatitis B infection, vaccination of newborns has not only reduced the risk of infection, but has also led to a marked reduction in liver cancer. This was reported in Taiwan where the implementation of a nationwide hepatitis B vaccination program in 1984 was associated with a decline in the incidence of childhood hepatocellular carcinoma. [21]
In the UK, the vaccine is offered to men who have sex with men (MSM), usually as part of a sexual health check-up. A similar situation is in operation in Ireland. [22]
In many areas, vaccination against hepatitis B is also required for all health-care and laboratory staff. [23] Both types of the vaccine, the plasma-derived vaccine (PDV) and recombinant vaccine (RV), seems to be able to elicit similar protective anti-HBs levels. [14]
The US Centers for Disease Control and Prevention (CDC) issued recommendations for vaccination against hepatitis B among patients with diabetes mellitus. [24] The World Health Organization (WHO) recommends a pentavalent vaccine, combining vaccines against diphtheria, tetanus, pertussis and Haemophilus influenzae type B with the vaccine against hepatitis B.[ medical citation needed ] There is not yet sufficient evidence on how effective this pentavalent vaccine is in relation to the individual vaccines. [25] A pentavalent vaccine combining vaccines against diphtheria, tetanus, pertussis, hepatitis B, and poliomyelitis is approved in the U.S. and is recommended by the Advisory Committee on Immunization Practices (ACIP). [26] [27] [28]
Hepatitis B vaccination, hepatitis B immunoglobulin, and the combination of hepatitis B vaccine plus hepatitis B immunoglobulin, all are considered as preventive for babies born to mothers infected with hepatitis B virus (HBV). [29] The combination is superior for protecting these infants. [29] The effectiveness of being vaccinated during pregnancy to prevent vertical transmission of hepatitis B to infants has not been studied. [30] Hepatitis B immunoglobulin before birth has not been well studied. [31]
Studies have found that that immune memory against HepB is sustained for at least 30 years after vaccination, and protects against clinical disease and chronic HepB infection, even in cases where anti-hepatitis B surface antigen (anti-Hbs) levels decline below detectable levels. [32] Testing to confirm successful immunization or sustained immunity is not necessary or recommended for most people, but is recommended for infants born to a mother who tests positive for HBsAg or whose HBsAg status is not known; for healthcare and public safety workers; for immunocompromised people such as haemodialysis patients, HIV patients, haematopoietic stem cell transplant [HSCT] recipients, or people receiving chemotherapy; and for sexual partners of HBsAg-positive people. [32]
An anti-Hbs antibody level above 100 mIU/ml is deemed adequate, and occurs in about 85–90% of individuals. [33] An antibody level between 10 and 100 mIU/ml is considered a poor response, and these people should receive a single booster vaccination at this time, but do not need further retesting. [33] People who fail to respond (anti-Hbs antibody level below 10 mIU/ml) should be tested to exclude current or past hepatitis B infection, and given a repeat course of three vaccinations, followed by further retesting 1–4 months after the second course. Those who still do not respond to a second course of vaccination may respond to intradermal injection [34] or to a high dose vaccine [35] or to a double dose of a combined hepatitis A and B vaccine. [36] Those who still fail to respond will require hepatitis B immunoglobulin (HBIG) if later exposed to the hepatitis B virus. [33]
Poor responses are mostly associated with being over the age of 40 years, obesity, celiac disease, and tobacco smoking, [34] [37] and also in alcoholics, especially if with advanced liver disease. [38] People who are immunosuppressed or on dialysis may not respond as well and require larger or more frequent doses of vaccine. [33] At least one study suggests that hepatitis B vaccination is less effective in patients with HIV. [39] The immune response to the hepatitis B vaccine can be impaired by the presence of parasitic infections such as helminthiasis. [40]
Hepatitis B vaccine is now believed to provide indefinite protection. Older literature assumed that immunity would wane with antibody titers and only effectively last five to seven years, [41] [42] but immune-challenge studies show that even after 30 years, the immune system maintains the ability to produce an anamnestic response, i.e. to rapidly bump up antibody levels when the previously seen antigen is detected. [43] [44] This shows that the immunological memory is not affected by the loss of antibody levels. As a result, subsequent antibody testing and administration of booster doses is not required in successfully vaccinated immunocompetent individuals. [45] [46] UK guidelines suggest that people who respond to the vaccine and are at risk of occupational exposure, such as for healthcare workers, a single booster is recommended five years after initial immunization. [33]
Serious side effects from the hepatitis B vaccine are very rare. [13] Pain may occur at the site of injection. [13] It is generally considered safe for use, during pregnancy or while breastfeeding. [13] [47] It has not been linked to Guillain–Barré syndrome. [13]
Several studies have looked for an association between recombinant hepatitis B vaccine and multiple sclerosis (MS) in adults. [48] Most studies do not support a causal relationship between hepatitis B vaccination and demyelinating diseases such as MS. [48] [49] [50] A 2004 study reported a significant increase in risk within three years of vaccination. Some of these studies were criticized for methodological problems. [51] This controversy created public misgivings about hepatitis B vaccination, and hepatitis B vaccination in children remained low in several countries. A 2006 study concluded that evidence did not support an association between hepatitis B vaccination and sudden infant death syndrome, chronic fatigue syndrome, or multiple sclerosis. [52] A 2007 study found that the vaccination does not seem to increase the risk of a first episode of MS in childhood. [53] Hepatitis B vaccination has not been linked to onset of autoimmune diseases in adulthood. [54]
The following is a list of countries by the percentage of infants receiving three doses of hepatitis B vaccine as published by the World Health Organization (WHO) in 2017. [56]
Hepatitis B (HepB3) immunization coverage among one-year-olds worldwide | |
---|---|
Country | Coverage % |
Afghanistan | 65 |
Albania | 99 |
Algeria | 91 |
Andorra | 98 |
Angola | 52 |
Antigua and Barbuda | 95 |
Argentina | 86 |
Armenia | 94 |
Australia | 95 |
Austria | 90 |
Azerbaijan | 95 |
Bahamas | 94 |
Bahrain | 98 |
Bangladesh | 97 |
Barbados | 90 |
Belarus | 98 |
Belgium | 97 |
Belize | 88 |
Benin | 82 |
Bhutan | 98 |
Bolivia (Plurinational State of) | 83 |
Bosnia and Herzegovina | 77 |
Botswana | 95 |
Brazil | 93 |
Brunei Darussalam | 99 |
Bulgaria | 92 |
Burkina Faso | 91 |
Burundi | 91 |
Côte d'Ivoire | 84 |
Cabo Verde | 86 |
Cambodia | 93 |
Cameroon | 86 |
Canada | 69 |
Central African Republic | 47 |
Chad | 41 |
Chile | 93 |
China | 99 |
Colombia | 92 |
Comoros | 91 |
Congo | 69 |
Cook Islands | 99 |
Costa Rica | 97 |
Croatia | 94 |
Cuba | 99 |
Cyprus | 97 |
Czech Republic | 94 |
Democratic People's Republic of Korea | 97 |
Democratic Republic of the Congo | 81 |
Djibouti | 68 |
Dominica | 91 |
Dominican Republic | 81 |
Ecuador | 84 |
Egypt | 94 |
El Salvador | 85 |
Equatorial Guinea | 25 |
Eritrea | 95 |
Estonia | 92 |
Eswatini | 90 |
Ethiopia | 73 |
Fiji | 99 |
France | 90 |
Gabon | 75 |
Gambia | 92 |
Georgia | 91 |
Germany | 87 |
Ghana | 99 |
Greece | 96 |
Grenada | 96 |
Guatemala | 82 |
Guinea | 45 |
Guinea-Bissau | 87 |
Guyana | 97 |
Haiti | 58 |
Honduras | 97 |
India | 88 |
Indonesia | 79 |
Iran (Islamic Republic of) | 99 |
Iraq | 63 |
Ireland | 95 |
Israel | 97 |
Italy | 94 |
Jamaica | 93 |
Jordan | 99 |
Kazakhstan | 99 |
Kenya | 82 |
Kiribati | 90 |
Kuwait | 99 |
Kyrgyzstan | 92 |
Lao People's Democratic Republic | 85 |
Latvia | 98 |
Lebanon | 78 |
Lesotho | 93 |
Liberia | 86 |
Libya | 94 |
Lithuania | 94 |
Luxembourg | 94 |
Macedonia | 91 |
Madagascar | 74 |
Malawi | 88 |
Malaysia | 98 |
Maldives | 99 |
Mali | 66 |
Malta | 88 |
Marshall Islands | 82 |
Mauritania | 81 |
Mauritius | 96 |
Mexico | 93 |
Micronesia (Federated States of) | 80 |
Monaco | 99 |
Mongolia | 99 |
Montenegro | 73 |
Morocco | 99 |
Mozambique | 80 |
Myanmar | 89 |
Namibia | 88 |
Nauru | 87 |
Nepal | 90 |
Netherlands | 92 |
New Zealand | 94 |
Nicaragua | 98 |
Niger | 81 |
Nigeria | 42 |
Niue | 99 |
Oman | 99 |
Pakistan | 75 |
Palau | 98 |
Panama | 81 |
Papua New Guinea | 56 |
Paraguay | 91 |
Peru | 83 |
Philippines | 88 |
Poland | 95 |
Portugal | 98 |
Qatar | 97 |
Republic of Korea | 98 |
Republic of Moldova | 89 |
Romania | 92 |
Russian Federation | 97 |
Rwanda | 98 |
Saint Kitts and Nevis | 98 |
Saint Lucia | 80 |
Saint Vincent and the Grenadines | 99 |
Samoa | 73 |
San Marino | 86 |
São Tomé and Príncipe | 95 |
Saudi Arabia | 98 |
Senegal | 91 |
Serbia | 93 |
Seychelles | 98 |
Sierra Leone | 90 |
Singapore | 96 |
Slovakia | 96 |
Solomon Islands | 99 |
Somalia | 42 |
South Africa | 66 |
Spain | 93 |
Sri Lanka | 99 |
Sudan | 95 |
Suriname | 81 |
Swaziland | 98 |
Sweden | 76 |
Syrian Arab Republic | 52 |
Tajikistan | 96 |
Thailand | 99 |
Timor-Leste | 76 |
Togo | 90 |
Tonga | 81 |
Trinidad and Tobago | 89 |
Tunisia | 98 |
Turkey | 96 |
Turkmenistan | 99 |
Tuvalu | 96 |
Uganda | 85 |
Ukraine | 52 |
United Arab Emirates | 98 |
United Republic of Tanzania | 97 |
United States of America | 93 |
Uruguay | 95 |
Uzbekistan | 99 |
Vanuatu | 85 |
Venezuela (Bolivarian Republic of) | 84 |
Viet Nam | 94 |
Yemen | 68 |
Zambia | 94 |
Zimbabwe | 89 |
In 1963, the American physician/geneticist Baruch Blumberg, working at the Fox Chase Cancer Center, discovered what he called the "Australia Antigen" (HBsAg) in the serum of an Australian Aboriginal person. [57] In 1968, this protein was found to be part of the virus that causes "serum hepatitis" (hepatitis B) by virologist Alfred Prince. [58]
In 1976, Blumberg won the Nobel Prize in Physiology or Medicine for his work on hepatitis B (sharing it with Daniel Carleton Gajdusek for his work on kuru). [59] Blumberg had identified Australia antigen, the important first step, and later discovered the way to make the first hepatitis B vaccine. Blumberg's vaccine was a unique approach to the production of a vaccine; that is, obtaining the immunizing antigen directly from the blood of human carriers of the virus. In October 1969, acting on behalf of the Institute for Cancer Research, they filed an application for a patent for the production of a vaccine. This patent [USP 3,636,191] was subsequently (January 1972) granted in the United States and other countries. In 2002, Blumberg published a book, Hepatitis B: The Hunt for a Killer Virus. [60] In the book, Blumberg wrote: “It took some time before the concept was accepted by virologists and vaccine manufacturers who were more accustomed to dealing with vaccines produced by attenuation of viruses, or the use of killed viruses produced in tissue culture, or related viruses that were non-pathogenic protective (i.e., smallpox). However, by 1971, we were able to interest Merck, which had considerable experience with vaccines."
During the next few years, a series of human and primate observations by scientists including Maurice Hilleman (who was responsible for vaccines at Merck), S. Krugman, R. Purcell, P. Maupas, and others provided additional support for the vaccine. In 1980, the results of the first field trial were published by W. Szmuness and his colleagues in New York City."
The American microbiologist/vaccinologist Maurice Hilleman at Merck used three treatments (pepsin, urea and formaldehyde) of blood serum together with rigorous filtration to yield a product that could be used as a safe vaccine. Hilleman hypothesized that he could make an HBV vaccine by injecting patients with hepatitis B surface protein. In theory, this would be very safe, as these excess surface proteins lacked infectious viral DNA. The immune system, recognizing the surface proteins as foreign, would manufacture specially shaped antibodies, custom-made to bind to, and destroy, these proteins. Then, in the future, if the patient were infected with HBV, the immune system could promptly deploy protective antibodies, destroying the viruses before they could do any harm. [61]
Hilleman collected blood from gay men and intravenous drug users—groups known to be at risk for viral hepatitis. This was in the late 1970s, when HIV was yet unknown to medicine. In addition to the sought-after hepatitis B surface proteins, the blood samples likely contained HIV. Hilleman devised a multistep process to purify this blood so that only the hepatitis B surface proteins remained. Every known virus was killed by this process, and Hilleman was confident that the vaccine was safe. [61]
The first large-scale trials for the blood-derived vaccine were performed on gay men, in accordance with their high-risk status. Later, Hilleman's vaccine was falsely blamed for igniting the AIDS epidemic. (See Wolf Szmuness) But, although the purified blood vaccine seemed questionable, it was determined to have indeed been free of HIV. The purification process had destroyed all viruses—including HIV. [61] The vaccine was approved in 1981. [17]
The blood-derived hepatitis B vaccine was withdrawn from the marketplace in 1986, replaced by Maurice Hilleman's improved recombinant hepatitis B vaccine which was approved by the FDA on 23 July 1986. [17] [19] [62] It was the first human vaccine produced by recombinant DNA methods. [62] For this work, scientists at Merck & Co. collaborated with William J. Rutter and colleagues at the University of California at San Francisco, as well as Benjamin Hall and colleagues at the University of Washington. [63] In 1981, William J. Rutter, Pablo DT Valenzuela and Edward Penhoet (UC Berkeley) co-founded the Chiron Corporation in Emeryville, California, which collaborated with Merck. [63] [64]
The recombinant vaccine is based on Hepatitis B surface antigen (HBsAg) gene inserted into yeast ( Saccharomyces cerevisiae ) cells which are free of any concerns associated with human blood products. [17] [65] This allows the yeast to produce only the noninfectious surface protein, without any danger of introducing actual viral DNA into the final product. [61] The vaccine contains the adjuvant amorphous aluminum hydroxyphosphate sulfate. [65]
In 2017, a two-dose HBV vaccine for adults, Heplisav-B gained U.S. Food and Drug Administration (FDA) approval. [4] It uses recombinant HB surface antigen, similar to previous vaccines, but includes a novel CpG 1018 adjuvant, a 22-mer phosphorothioate-linked oligodeoxynucleotide. It was non-inferior with respect to immunogenicity. [66]
In November 2021, Hepatitis B Vaccine (Recombinant) (Prehevbrio) was approved by the FDA. [7] [67] [68] [69]
The US CDC ACIP first recommended the vaccine for all newborns in 1991. [70] Prior to this, the vaccine was only recommended for high-risk groups. As of the 1991 recommendation for universal newborn Hepatitis B vaccination, no other vaccines were routinely recommended for all newborns in the United States, and remains one of the very few vaccines routinely recommended for administration at birth.
The vaccine contains one of the viral envelope proteins, Hepatitis B surface antigen (HBsAg). It is produced by yeast cells, into which the gene for HBsAg has been inserted. [65] Afterward an immune system antibody to HBsAg is established in the bloodstream. The antibody is known as anti-HBs. This antibody and immune system memory then provide immunity to hepatitis B virus (HBV) infection. [71]
On 10 December 2020, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product Heplisav B, intended for the active immunization against hepatitis B virus infection (HBV). [72] The applicant for this medicinal product is Dynavax GmbH. [72] It was approved for medical use in the European Union in February 2021. [9]
On 24 February 2022, the CHMP adopted a positive opinion, recommending the granting of a marketing authorization for the medicinal product PreHevbri, intended for the active immunization against hepatitis B virus infection (HBV). [73] The applicant for this medicinal product is VBI Vaccines B.V. [73] PreHevbri was approved for medical use in the European Union in April 2022. [10] [12]
The common brands available are Recombivax HB (Merck), [5] Engerix-B (GSK), [6] Elovac B (Human Biologicals Institute, a division of Indian Immunologicals Limited), Genevac B (Serum Institute), Shanvac B, Heplisav-B, [4] [9] , Prehevbrio, [7] and Euvax B (LG Chem). [74]
Twinrix (GSK) is a vaccine against hepatitis A and hepatitis B. [75] [76]
Pediarix is a vaccine against diphtheria, tetanus, pertussis, hepatitis B, and poliomyelitis. [77]
Vaxelis is a vaccine against diphtheria, tetanus, pertussis, poliomyelitis, Haemophilus influenzae type B (Meningococcal Protein Conjugate), and hepatitis B. [78] [79]
Fendrix (hepatitis B (rDNA) vaccine (adjuvanted, adsorbed)) was approved for medical use in the European Union in 2005. [80]
Hepatitis is inflammation of the liver tissue. Some people or animals with hepatitis have no symptoms, whereas others develop yellow discoloration of the skin and whites of the eyes (jaundice), poor appetite, vomiting, tiredness, abdominal pain, and diarrhea. Hepatitis is acute if it resolves within six months, and chronic if it lasts longer than six months. Acute hepatitis can resolve on its own, progress to chronic hepatitis, or (rarely) result in acute liver failure. Chronic hepatitis may progress to scarring of the liver (cirrhosis), liver failure, and liver cancer.
In immunology, seroconversion is the development of specific antibodies in the blood serum as a result of infection or immunization, including vaccination. During infection or immunization, antigens enter the blood, and the immune system begins to produce antibodies in response. Before seroconversion, the antigen itself may or may not be detectable, but the antibody is absent. During seroconversion, the antibody is present but not yet detectable. After seroconversion, the antibody is detectable by standard techniques and remains detectable unless the individual seroreverts, in a phenomenon called seroreversion, or loss of antibody detectability, which can occur due to weakening of the immune system or decreasing antibody concentrations over time. Seroconversion refers the production of specific antibodies against specific antigens, meaning that a single infection could cause multiple waves of seroconversion against different antigens. Similarly, a single antigen could cause multiple waves of seroconversion with different classes of antibodies. For example, most antigens prompt seroconversion for the IgM class of antibodies first, and subsequently the IgG class.
The DPT vaccine or DTP vaccine is a class of combination vaccines to protect against three infectious diseases in humans: diphtheria, pertussis, and tetanus (lockjaw). The vaccine components include diphtheria and tetanus toxoids, and either killed whole cells of the bacterium that causes pertussis or pertussis antigens. The term toxoid refers to vaccines which use an inactivated toxin produced by the pathogen which they are targeted against to generate an immune response. In this way, the toxoid vaccine generates an immune response which is targeted against the toxin which is produced by the pathogen and causes disease, rather than a vaccine which is targeted against the pathogen itself. The whole cells or antigens will be depicted as either "DTwP" or "DTaP", where the lower-case "w" indicates whole-cell inactivated pertussis and the lower-case "a" stands for "acellular". In comparison to alternative vaccine types, such as live attenuated vaccines, the DTP vaccine does not contain any live pathogen, but rather uses inactivated toxoid to generate an immune response; therefore, there is not a risk of use in populations that are immune compromised since there is not any known risk of causing the disease itself. As a result, the DTP vaccine is considered a safe vaccine to use in anyone and it generates a much more targeted immune response specific for the pathogen of interest.
Post-exposure prophylaxis, also known as post-exposure prevention (PEP), is any preventive medical treatment started after exposure to a pathogen in order to prevent the infection from occurring.
Influenza vaccines, colloquially known as flu shots or the flu jab, are vaccines that protect against infection by influenza viruses. New versions of the vaccines are developed twice a year, as the influenza virus rapidly changes. While their effectiveness varies from year to year, most provide modest to high protection against influenza. Vaccination against influenza began in the 1930s, with large-scale availability in the United States beginning in 1945.
Artificial induction of immunity is immunization achieved by human efforts in preventive healthcare, as opposed to natural immunity as produced by organisms' immune systems. It makes people immune to specific diseases by means other than waiting for them to catch the disease. The purpose is to reduce the risk of death and suffering, that is, the disease burden, even when eradication of the disease is not possible. Vaccination is the chief type of such immunization, greatly reducing the burden of vaccine-preventable diseases.
A booster dose is an extra administration of a vaccine after an earlier (primer) dose. After initial immunization, a booster provides a re-exposure to the immunizing antigen. It is intended to increase immunity against that antigen back to protective levels after memory against that antigen has declined through time. For example, tetanus shot boosters are often recommended every 10 years, by which point memory cells specific against tetanus lose their function or undergo apoptosis.
Hepatitis B is endemic in China. Of the 350 million individuals worldwide infected with the hepatitis B virus (HBV), one-third reside in China. As of 2006 China has immunized 11.1 million children in its poorest provinces as part of several programs initiated by the Chinese government and as part of the Global Alliance for Vaccines and Immunization (GAVI). However, the effects of these programs have yet to reach levels of immunization that would limit the spread of hepatitis B effectively.
Combined hepatitis A and B vaccine, is used to provide protection against hepatitis A and hepatitis B. It is given by injection into muscle.
A breakthrough infection is a case of illness in which a vaccinated individual becomes infected with the illness, because the vaccine has failed to provide complete immunity against the pathogen. Breakthrough infections have been identified in individuals immunized against a variety of diseases including mumps, varicella (Chickenpox), influenza, and COVID-19. The characteristics of the breakthrough infection are dependent on the virus itself. Often, infection of the vaccinated individual results in milder symptoms and shorter duration than if the infection were contracted naturally.
A zoster vaccine is a vaccine that reduces the incidence of herpes zoster (shingles), a disease caused by reactivation of the varicella zoster virus, which is also responsible for chickenpox. Shingles provokes a painful rash with blisters, and can be followed by chronic pain, as well as other complications. Older people are more often affected, as are people with weakened immune systems (immunosuppression). Both shingles and postherpetic neuralgia can be prevented by vaccination.
Varicella vaccine, also known as chickenpox vaccine, is a vaccine that protects against chickenpox. One dose of vaccine prevents 95% of moderate disease and 100% of severe disease. Two doses of vaccine are more effective than one. If given to those who are not immune within five days of exposure to chickenpox it prevents most cases of disease. Vaccinating a large portion of the population also protects those who are not vaccinated. It is given by injection just under the skin. Another vaccine, known as zoster vaccine, is used to prevent diseases caused by the same virus – the varicella zoster virus.
Hepatitis A vaccine is a vaccine that prevents hepatitis A. It is effective in around 95% of cases and lasts for at least twenty years and possibly a person's entire life. If given, two doses are recommended beginning after the age of one. It is given by injection into a muscle. The first hepatitis A vaccine was approved in the European Union in 1991, and the United States in 1995. It is on the World Health Organization's List of Essential Medicines.
The Haemophilus influenzae type B vaccine, also known as Hib vaccine, is a vaccine used to prevent Haemophilus influenzae type b (Hib) infection. In countries that include it as a routine vaccine, rates of severe Hib infections have decreased more than 90%. It has therefore resulted in a decrease in the rate of meningitis, pneumonia, and epiglottitis.
Hepatitis B is an infectious disease caused by the hepatitis B virus (HBV) that affects the liver; it is a type of viral hepatitis. It can cause both acute and chronic infection.
Measles vaccine protects against becoming infected with measles. Nearly all of those who do not develop immunity after a single dose develop it after a second dose. When the rate of vaccination within a population is greater than 92%, outbreaks of measles typically no longer occur; however, they may occur again if the rate of vaccination decreases. The vaccine's effectiveness lasts many years. It is unclear if it becomes less effective over time. The vaccine may also protect against measles if given within a couple of days after exposure to measles.
Yellow fever vaccine is a vaccine that protects against yellow fever. Yellow fever is a viral infection that occurs in Africa and South America. Most people begin to develop immunity within ten days of vaccination and 99% are protected within one month, and this appears to be lifelong. The vaccine can be used to control outbreaks of disease. It is given either by injection into a muscle or just under the skin.
Hepatitis B immunoglobulin (HBIG) is a human immunoglobulin that is used to prevent the development of hepatitis B and is used for the treatment of acute exposure to HBsAg.
Tetanus vaccine, also known as tetanus toxoid (TT), is a toxoid vaccine used to prevent tetanus. During childhood, five doses are recommended, with a sixth given during adolescence.
DTaP-IPV-HepB vaccine is a combination vaccine whose generic name is diphtheria and tetanus toxoids and acellular pertussis adsorbed, hepatitis B (recombinant) and inactivated polio vaccine or DTaP-IPV-Hep B. It protects against the infectious diseases diphtheria, tetanus, pertussis, poliomyelitis, and hepatitis B.
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